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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9710e0c0dfac7fe07b9dff4519c982dc26de93fae604db45eb41c2ace0c7fb31' 
  AND token = 'g1S0g4sCOtq8tBCBHSx2oeusiB365ycrHEP0m3OIACI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}